Method and device for measuring humidity

a technology of humidity and measurement method, applied in the direction of material analysis, material thermal analysis, instruments, etc., can solve the problems of increasing the total expenditure of a conventional device, measuring errors often occur in the high-humidity range (rh>95%), etc., and achieve the effect of reliable determination of relative humidity and small expenditur

Inactive Publication Date: 2005-02-10
E E ELEKTRONIK GES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It is an aspect of the present invention to provide a method and a device for measuring humidity, in order to additionally allow a reliable determination of the relative humidity in the high-humidity range with as little expenditure as possible.

Problems solved by technology

When measuring relative humidity with the aid of sensor devices having capacitive humidity sensor elements, measuring errors often occur in the high-humidity range (rH>95%).
This may result in an increased total expenditure within a conventional device, when, in addition to or in place of the absolute humidity, relative humidity rH is also needed as a measured quantity.

Method used

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  • Method and device for measuring humidity
  • Method and device for measuring humidity

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Embodiment Construction

FIG. 1 is a highly schematic block diagram of an example embodiment of a device according to the present invention. The represented components are briefly explained, while the method of an example embodiment of the present invention and a device suitable for implementing it, as well as different exemplary embodiment options of the same, are subsequently described in detail with reference to FIGS. 2a to 2c, 3a to 3c, and 4a to 4c.

With sensor-device 10 and post-connected sequential electronics 20, the device of an example embodiment of the present invention includes two functional units or functional blocks. In the represented example, sensor device 10 is provided with a humidity-sensor element 11 and a temperature-sensor element 12, which are arranged on a common carrier substrate 13. Humidity-sensor element 11 may take the form of a capacitive humidity-sensor element made up of two planar electrodes, between which, e.g., a polymer in the form of a dielectric is arranged, the capac...

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Abstract

A method and a device for measuring humidity may be suitable for determining the relative humidity in the high-humidity range. The device includes a sensor device, as well as sequential electronics post-connected to the same. The sensor device includes a capacitive humidity-sensor element, a temperature-sensor element, and a heating element, the humidity-sensor element being heated in at least one part of the humidity-measuring range. The ambient temperature is further ascertained by the sequential electronics, from the heating power required in the heating mode, as well as from the measured, local sensor device temperature, in order to further determine the relative humidity.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application claims priority to Application No. 103 35 553.7, filed in the Federal Republic of Germany on Aug. 2, 2003, which is expressly incorporated herein in its entirety by reference thereto. FIELD OF THE INVENTION The present invention relates to a method and a device for measuring humidity. BACKGROUND INFORMATION When measuring relative humidity with the aid of sensor devices having capacitive humidity sensor elements, measuring errors often occur in the high-humidity range (rH>95%). In particular, relative humidity readings that are too high are sometimes measured in this connection. A number of causes may be responsible for this effect, for example, the general saturation behavior of the humidity-sensor elements, the beginning condensation and the resulting short-circuits at the contacts of the humidity-sensor elements, etc. European Published Patent Application 0 801 302 describes a method and a device for determini...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N25/62G01N25/56G01N27/22
CPCG01N27/223
Inventor MITTER, HELMUT
Owner E E ELEKTRONIK GES
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